Re: [Netconf] SSH question

[Juergen Schoenwaelder <j.schoenwaelder at jacobs-university.de>]

On Thu, Jun 18, 2009 at 07:36:34PM +0200, Andy Bierman wrote:
 
> You know about openssh, and the ClientAliveInterval messages
> that it sends (keepalive at openssh.com)?  The client is
> supposed to send data on the channel before N of these
> arrive.
> 
> It seems that libssh2 drops these messages.
> But if the NETCONF manager wanted to answer,
> what can it send to the agent?  whitespace?
> an XML comment?
> 
> Is the agent supposed to handle (discard) non-PDU messages
> received on its channel? What is the most interoperable
> way to send data to the agent without actually issuing
> an <rpc> and wasting resources?

I think you are confusing protocol layers. The keepalive at openssh.com
messages are sent as part of the SSH Connection Protocol (see RFC
4254) and they should trigger an SSH Connection Protocol reply. They
should never show up in the data stream carried over an SSH channel.
If they do, then the SSH implementation needs to be fixed.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1, 28759 Bremen, Germany
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